/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.lealone.cgroup;

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;

public class Threads {

    private interface CLibrary extends Library {
        int syscall(int api);
    }

    // 64位是186，32位是224
    private static final int __NR_gettid = Platform.is64Bit() ? 186 : 224;

    private static final CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"),
            CLibrary.class);

    public static int getThreadId() {
        return INSTANCE.syscall(__NR_gettid);
    }

}
